Definition of isosceles in English:

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Pronunciation: /īˈsäsəˌlēz/


(Of a triangle) having two sides of equal length.
Example sentences
  • The base angles of an isosceles triangle are equal.
  • Mathematicians sometimes say that A is an arbitrary isosceles triangle, but all they mean is that A could be any such triangle.
  • First construct an isosceles triangle whose base angles are double the vertex angle.


Mid 16th century: via late Latin from Greek isoskelēs, from isos 'equal' + skelos 'leg'.

For editors and proofreaders

Syllabification: i·sos·ce·les

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